Question

A certain lever system is only 30% efficient. What could make it more efficient? (1 point)
Responses

Use a stiffer lever to reduce energy lost bending the lever.
Use a stiffer lever to reduce energy lost bending the lever.

Use it with a lighter load to make it easier.
Use it with a lighter load to make it easier.

Have more than one person help to lift the lever.
Have more than one person help to lift the lever.

Make a longer lever that will require less force.

Answer 1

Use a stiffer lever to reduce energy lost bending the lever.

Reason: Efficiency = useful output work / input work. Bending (and other losses) waste input energy; a stiffer lever reduces bending losses so a greater fraction of the input becomes useful output. The other options don't reliably increase efficiency.